<template>
    <div>
      <!-- 面包屑导航 -->
      <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item><a href="/goods">商品管理</a></el-breadcrumb-item>
        <el-breadcrumb-item :to="{ path: '/goods' }">商品列表</el-breadcrumb-item>
        <el-breadcrumb-item>商品编辑</el-breadcrumb-item>
      </el-breadcrumb>
      <!-- 卡片视图区域 -->
      <el-card>
        <!-- 提示区域 -->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
        <!-- 步骤条 -->
        <el-steps :active="activeIndex" align-center finish-status="success" :space="200">
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>
        <!-- 表单内容区域 -->
        <el-form ref="editFormRef" label-width="100px" label-position="top" :model="editForm" :rules="editFormRules">
          <!-- tab标签页区域:左侧tab选线 -->
          <el-tabs v-model="activeIndex" tab-position="left" @tab-click="handleTabClick" :before-leave="beforeLeaveHandler">
            <el-tab-pane label="基本信息" :name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="editForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model.number="editForm.goods_price"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="editForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="editForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader ref="cateHandle" v-model="selectedKeys" :options="parentCateList" :props="cascaderProps" @change="parentCateChange" clearable change-on-select></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" :name="1">
              <template v-if="manyTableData.length">
                <!-- 渲染表单的item项 -->
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                  <!-- 复选框组 -->
                  <el-checkbox-group v-model="item.attr_vals_arr">
                    <el-checkbox :label="cb" :value="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
                  </el-checkbox-group>
                </el-form-item>
              </template>
              <div v-else>暂无参数数据</div>
            </el-tab-pane>
            <el-tab-pane label="商品属性" :name="2">
              <template v-if="onlyTableData.length">
                <!-- 渲染表单的item项 -->
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                  <!-- 下拉框组 -->
                  <el-select v-if="item.attr_vals.length > 1" v-model="item.attr_vals_arr" size="large" style="width: 240px">
                    <el-option v-for="(cb, i) in item.attr_vals" :key="i" :label="cb" :value="cb" />
                  </el-select>
                  <el-input v-else v-model="item.attr_vals_arr"></el-input>
                </el-form-item>
              </template>
              <div v-else>暂无参数数据</div>
            </el-tab-pane>
            <el-tab-pane label="商品图片" :name="3">
              <!-- action:图片上传的后台api接口 -->
              <!-- list-type="picture":预览图片的效果 -->
              <!-- headers:添加请求头部，手动添加请求头部，保存到data中 -->
              <el-upload
                v-model:file-list="fileList"
                list-type="picture-card"
                :headers="headers"
                class="avatar-uploader"
                name="file"
                :action="`${baseURL}/upload`"
                :show-file-list="true"
                :on-success="handleAvatarSuccess"
                :on-remove="handleRemove"
                :on-preview="handlePictureCardPreview"
                :before-upload="handleBeforeUpload"
              >
                <el-icon class="avatar-uploader-icon"><Plus /></el-icon>
              </el-upload>
              <!-- 图片预览 -->
              <el-dialog v-model="dialogVisible">
                <img class="previewImg" w-full :src="dialogImageUrl" alt="Preview Image" />
              </el-dialog>
            </el-tab-pane>
            <el-tab-pane label="商品内容" :name="4">
              <div style="border: 1px solid #ccc">
                <Toolbar style="border-bottom: 1px solid #ccc" :editor="editorRef" :defaultConfig="toolbarConfig" :mode="mode" />
                <Editor style="min-height: 500px; overflow-y: hidden" v-model="goods_introduce" :defaultConfig="editorConfig" :mode="mode" @onCreated="handleCreated" />
              </div>
              <el-button type="primary" class="btnAdd" @click="editGoods">编辑商品</el-button>
            </el-tab-pane>
          </el-tabs>
        </el-form>
      </el-card>
    </div>
  </template>
  
  <script setup>
  import { ref, computed, onBeforeUnmount, shallowRef, onMounted, watch } from 'vue'
  import { getCateListApi } from '@/api/cate'
  import { getAttrListApi } from '@/api/params'
  import { addGoodsApi, getGoodsDetailApi, editGoodsApi } from '@/api/goods'
  import { message } from '@/utils/functions'
  import { baseURL } from '@/utils/request'
  import { Plus } from '@element-plus/icons-vue'
  // 在线文本编辑器相关代码
  import '@wangeditor/editor/dist/css/style.css' // 引入 css
  import { Editor, Toolbar } from '@wangeditor/editor-for-vue'
  // 从pinia中获取token
  import { useUserStore } from '@/stores/user'
  import { useRouter, useRoute } from 'vue-router'
  const route = useRoute()
  const router = useRouter()
  const userStore = useUserStore()
  const token = userStore.token
  const headers = {
    Authorization: token
  }
  
  // 根据商品id获取商品数据
  const getGoodsDetail = async id => {
    const data = await getGoodsDetailApi(id)
    editForm.value = data
    selectedKeys.value = data.goods_cat.split(',')
    // 处理图片数据
    fileList.value = data.pics.map(item => ({
      name: '',
      url: item.pics_big_url
    }))
    // 属性处理：方案，更具attr_sel的值为only何many去修改onlyTableData和manyTableData中的数据
    // 在线文本编辑器内容的回显
    goods_introduce.value = data.goods_introduce
  }
  // 侦听路由参数的变化
  watch(
    () => route.params.id,
    id => {
      // 获取商品数据
      getGoodsDetail(id)
    },
    { immediate: true },
    { deep: true }
  )
  
  // 编辑器实例，必须用 shallowRef
  const editorRef = shallowRef()
  // 内容 HTML
  const goods_introduce = ref('')
  // 工具栏的配置
  const toolbarConfig = {}
  // 编辑器的配置
  const editorConfig = {
    placeholder: '请输入内容...',
    MENU_CONF: {
      // 文件上传相关的配置
      uploadImage: {
        base64LimitSize: 5 * 1024, // 5kb
        server: `${baseURL}/upload`,
        headers: {
          Authorization: token
        },
        fieldName: 'file',
        // 自定义上传
        async customUpload(file, insertFn) {
          const url = URL.createObjectURL(file)
          // 最后插入图片
          insertFn(url)
        }
      }
    }
  }
  // 模式
  const mode = ref('simple')
  
  // 组件销毁时，也及时销毁编辑器
  onBeforeUnmount(() => {
    const editor = editorRef.value
    if (editor == null) return
    editor.destroy()
  })
  
  const handleCreated = editor => {
    editorRef.value = editor // 记录 editor 实例，重要！
  }
  
  // 步骤条激活的索引
  // tab选项卡激活的选项
  const activeIndex = ref(0)
  // 定义表单数据项
  const editForm = ref({
    goods_id: '',
    goods_name: '',
    goods_price: 0,
    goods_weight: 0,
    goods_number: 0,
    // 商品所属的分类id
    goods_cat: '',
    goods_introduce: '',
    pics: [],
    attrs: []
  })
  //  商品的表单数据验证规则
  const editFormRules = ref({
    goods_name: [
      { required: true, message: '请输入商品名称', trigger: 'blur' },
      {
        min: 2,
        max: 30,
        message: '商品名称的长度在2-30个字符之间',
        trigger: 'blur'
      }
    ],
    goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
    goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
    goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
    goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]
  })
  
  // 级联菜单相关
  // 分类数据
  const parentCateList = ref([])
  // 级联菜单选中项的值（每个下拉选项的value值的数组）
  const selectedKeys = ref([])
  // 配置级联菜单中数据如何展示
  const cascaderProps = ref({
    // 当要展示的下拉选项的数据的属性不是value和label时，需要配置该属性
    value: 'cat_id',
    label: 'cat_name',
    // 多级的数据的关联关系字段不是children时需要配置该属性
    children: 'children',
    // 默认情况下，级联菜单的选项是点击触发的，如果需要hover触发，需要配置该属性
    expandTrigger: 'hover',
    // 设置父子节点取消选中关联，从而达到选择任意一级选项的目的
    checkStrictly: true
  })
  
  // 获取所有分类数据
  const getparentCateList = async () => {
    const data = await getCateListApi({ type: 3 })
    parentCateList.value = data
  }
  getparentCateList()
  // 组件对象
  const cateHandle = ref(null)
  const parentCateChange = () => {
    if (selectedKeys.value === undefined) {
      // 分类id变成空字符串
      editForm.value.goods_cat = ''
      return
    }
    // 只允许选择三级分类作为参数所属的分类
    if (selectedKeys.value.length !== 3) {
      // 清空选中项
      selectedKeys.value = []
      // 分类id变成空字符串
      editForm.value.goods_cat = ''
      // 选中了父级后，让级联菜单隐藏
      cateHandle.value.togglePopperVisible(false)
      return
    }
    // 选中了父级后
    // 将选中的三级分类的id拼接成字符串
    editForm.value.goods_cat = selectedKeys.value.join(',')
    // 让级联菜单隐藏
    cateHandle.value.togglePopperVisible(false)
  }
  
  // 分类id
  const cat_id = computed(() => {
    if (selectedKeys.value === undefined) {
      return ''
    }
    return selectedKeys.value.length ? selectedKeys.value[selectedKeys.value.length - 1] : ''
  })
  
  // 动态参数数据
  const manyTableData = ref([])
  // 获取静态参数数据
  const onlyTableData = ref([])
  // 根据分类id和类型获取参数数据
  const getParamsData = async (cat_id, type) => {
    // 获取动态参数数据
    if (type === 'many') {
      const data = await getAttrListApi(cat_id, 'many')
      // 处理数据
      data.forEach(item => {
        // attr_vals是字符串，需要转换为数组
        item.attr_vals = item.attr_vals.split(',')
        // 用来收集复选框组选中的值
        item.attr_vals_arr = []
      })
      manyTableData.value = data
    } else {
      // 获取静态参数数据
      const data = await getAttrListApi(cat_id, 'only')
      // 处理数据
      data.forEach(item => {
        // attr_vals是字符串，需要转换为数组
        item.attr_vals = item.attr_vals.split(',')
        if (item.attr_vals.length === 1) {
          item.attr_vals_arr = item.attr_vals[0]
        } else {
          item.attr_vals_arr = item.attr_vals[0]
        }
      })
      onlyTableData.value = data
    }
  }
  
  // 切换选项卡时触发的事件
  const handleTabClick = async tab => {
    if (activeIndex.value === 1) {
      await getParamsData(cat_id.value, 'many')
    } else if (activeIndex.value === 2) {
      await getParamsData(cat_id.value, 'only')
    }
  }
  
  // tabs切换控制
  const beforeLeaveHandler = (activeName, old) => {
    if (activeName !== 0 && cat_id.value === '') {
      message('error', '请先选择三级分类菜单')
      return false
    }
    // 更改选项卡的索引
    activeIndex.value = activeName
    return true
  }
  
  // 上传图片
  
  // 最终存储图片的数据
  const fileList = ref([])
  const handleAvatarSuccess = (response, uploadFile, uploadFiles) => {
    if (response.meta.status === 200) {
      // 因为每次只上传一张图片，先置空原数组
      // fileList.value.length = 0
      // 添加图片数据
      fileList.value = uploadFiles.map(item => {
        return {
          name: item.name,
          tmp: item.response.data.tmp_path,
          url: item.response.data.url
        }
      })
    }
  }
  // 图片预览
  const dialogImageUrl = ref('')
  const dialogVisible = ref(false)
  
  // 图片删除的处理
  const handleRemove = (uploadFile, uploadFiles) => {
    // 多张图片，就删除当前要删除的这张
    fileList.value = uploadFiles.map(item => {
      return {
        name: item.name,
        tmp: item.tmp_path,
        url: item.url
      }
    })
  }
  // 图片预览
  const handlePictureCardPreview = file => {
    dialogImageUrl.value = file.url
    dialogVisible.value = true
  }
  
  // 图片上传前的验证
  const handleBeforeUpload = file => {
    // 定义上传文件的类型只能是图片格式
    const allowMineType = ['image/jpeg', 'image/png', 'image/gif', 'image/bmp']
    // 定义图片大小不能超过2M
    const isLt2M = file.size / 1024 / 1024 < 2
    if (!allowMineType.includes(file.type)) {
      message('error', '只能上传图片格式文件!')
      return false
    }
    if (!isLt2M) {
      message('error', '上传头像图片大小不能超过 2MB!')
      return false
    }
    return true
  }
  
  // 商品的编辑
  const editGoods = async () => {
    // 定义一个新的对象来收集接口需要的数据
    // 一部分基本数据来自于表单数据对象，可以实现拷贝
    const formData = Object.assign({}, editForm.value)
    // 获取图片地址
    formData.pics = fileList.value.map(item => ({
      pic: item.tmp
    }))
    // 获取动态参数数据
    formData.attrs = []
    manyTableData.value.forEach(item => {
      // 收集复选框选中的数据
      item.attr_vals_arr.forEach(val => {
        formData.attrs.push({
          attr_id: item.attr_id,
          attr_value: val
        })
      })
    })
    // 获取静态参数数据
    onlyTableData.value.forEach(item => {
      formData.attrs.push({
        attr_id: item.attr_id,
        attr_value: item.attr_vals_arr
      })
    })
    // 在线文本编辑器的内容
    formData.goods_introduce = goods_introduce.value
    // 编辑商品
    await editGoodsApi(formData)
    message('success', '编辑商品成功')
    activeIndex.value = 5
    router.push('/goods')
  }
  </script>
  
  <style lang="scss" scoped>
  // 图片上传区域配置
  .avatar-uploader {
    :deep(.el-upload) {
      margin: 0 50px;
      width: 148px;
      height: 148px;
      .el-upload-dragger {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        height: 100%;
      }
      .el-icon.avatar-uploader-icon {
        font-size: 28px;
        color: #8c939d;
        width: 148px;
        height: 148px;
        text-align: center;
      }
    }
  }
  // 图片预览，图片大小
  .previewImg {
    width: 100%;
    height: 100%;
  }
  // wangEditor 编辑器配置
  :deep(.w-e-text-container) {
    .w-e-scroll {
      height: 500px;
    }
  }
  
  // 商品添加按钮样式
  .btnAdd {
    margin-top: 15px;
  }
  </style>